Física preguntas y respuestas

A body of weight 400 Newton was plated on a rough inclined plane inclined to the horizontal at an angle of measure \( 30^{\circ} \). A force was applied to the body in the direction of the line of the greatest slope of the plane upward, so the body was about to move up the plane. If the coefficient of static friction between the body and the plane was \( \frac{1}{\sqrt{3}} \). Find the magnitude of the force.

(13) A body of weight 400 Newton was pla ed on a rough inclined plane inclined to the horizontal at an angle of measure \( 30^{\circ} \). A force was applied to the body in the direction of the line of the greatest slope of the plane upward, so the body was about to move up the plane. If the coefficient of static friction between the body and the plane was \( \frac{1}{\sqrt{3}} \). Find the magnitude of the force. (14) A body of weight 30 Newtons was placed on a rough inclined plane inclined to the horizontal at an angle of measure \( 60^{\circ} \). A force of magnitude 10 Newtons was applied to it in the direction of the line of the greatest slope of the plane upward, so the body was about to move downward. Find the magnitude of the force if it is known that the coefficient of static friction between the body and the plane is \( \frac{\sqrt{3}}{3} \) (15) A body of 30 Newtons weight was placed on a rough inclined plane inclined to the horizontal at an angle of measure \( \theta^{\circ} \). A force of magnitude \( 20 \sqrt{3} \) Newtons. It was applied to it in the direction of the line of the greatest slope of the plane upward, so the body was about to move upwards. Find the measure of the angle \( \theta \) if it is known that the coefficient of static friction between the body and the plane is \( \frac{\sqrt{3}}{3} \).

(11) A body of weight 60 Newtons was placed on a rough inclined plane inclined to the horizontal at an angle whose sine \( =\frac{3}{5} \). It was observed that the body is about to move under the action of its weight only. Find the coefficient of static friction between the body and the plane. (12) A body was placed on a rough inclined plane inclined to the horizontal at an angle of measure \( 60^{\circ} \). The coefficient of static friction between the body and the plane was \( \frac{\sqrt{3}}{2} \). Explain and state the reason why the body cannot remain in equilibrium on the plane. (13) A body of weight 400 Newton was pla ed on a rough inclined plane inclined to the horizontal at an angle of measure \( 30^{\circ} \). A force was applied to the body in the direction of the line of the greatest slope of the plane upward, so the body was about to move up the plane. If the coefficient of static friction between the body and the plane was \( \frac{1}{\sqrt{3}} \). Find the magnitudc of the force. (14) A body of weight 30 Newtons was placed on a rough inclined plane inclined to the horizontal at an angle of measure \( 60^{\circ} \). A force of magnitude 10 Newtons was applied to it in the direction of the line of the greatest slope of the plane upward, so the body was about to move downward. Find the magnitude of the force if it is known that the coefficient of static friction between the body and the plane is \( \frac{\sqrt{3}}{3} \) (15) A body of 30 Newtons weight was placed on a rough inclined plane inclined to the horizontal at an angle of measure \( \theta \). A force of magnitude \( 20 \sqrt{3} \) Newtons. It was applied to it in the direction of the line of the greatest slope of the plane upward, so the body was about to move upwards. Find the measure of the angle \( \theta \) if it is known that the coefficient of static friction between the body and the plane is \( \frac{\sqrt{3}}{3} \).

La Purte Sub rayadu EJERCICIO 1 ( 20 puntos): Un lote de material de construcción, se encuentre ubicado a 30 m del centro de una grúa giratoria, la cual gira con una rapidez angular constante de 0.8 rad/s, realizando 3 revoluciones. Luego, la grúa disminuye su rapidez angulara \( 0.2 \mathrm{rad} / \mathrm{s} \), recorriendo 10 metros con aceleración angular constante. Manteniendo esa aceleración, la grúa tiempo después se detiene. Determine: A) (7 puntos) La distancia total recorrida desde que la grúa comienza a moverse hasta que se detiene. B) (6 puntos) El tiempo total que duró el movimiento. C) (3 puntos) Calcule el módulo de la aceleración total dellote cuando la grúa gira con rapidez constante. D) ( 4 puntos) Calcule el módulo de la aceleración total del lote cuando la grúa desacelera, en el instante cuando \( \omega=0.2 \frac{\mathrm{rad}}{\mathrm{s}} \).

Un resorte sin masa cuya constante es de 50 niuton por metro y se cuel san vertical mente can ua masa de 400 gramos en su extremo libre si se estira 20 certim etros y lueso se suelta el resorte resibe mas calcula la frecuercia de oscilacion

3. Gjej fuqinē e njē motori i cili merr njè rymë me intensitet 5 A kur lidhet në burimin me tension 220 V .

4 Una camionetta dei pompieri viaggia a \( 30 \mathrm{~m} / \mathrm{s} \) con la sirena accesa, che emette un suono di pe- riodo \( 1,1 \mathrm{~ms} \). - Calcola il periodo dell'onda udita da un ragaz- zo fermo quando la camionetta si avvicina e quando si allontana. [1,0 \( \mathrm{ms}, 1,2 \mathrm{~ms}] \)

True or False: The two types of optical telescopes are refracting and reflecting. True False

For 1: b) Account for TEN SI derived units (of your choice) and present it as a table with three headings, un name, symbol, and quantity. c) Give the Sl prefix for each of the following multiples: both with name and symbol. i. \( 10^{-12} \) ii. \( 10^{-9} \) iii. \( 10^{-6} \) iv. \( 10^{-3} \) v. \( 10^{3} \) vi. \( 10^{5} \) vii. \( 10^{9} \) viii. \( 10^{12} \)

A body of weight W kg.wt was placed on a rough horizontal plane. The coefficient of static friction between it and the body was \( \frac{1}{5} \), affected by angle between them is \( 120^{\circ} \). The body was about to move. Find the value of W .